724 METASPERMAE OF THE MINNESOTA VALLEY. 
the last fifty years, by the agency of man. It is intended also 
to be exclusive of such North American species as have been 
distributed abroad by other than the so-called agencies of 
nature. The group of 317 species and varieties may be known 
as the Extra-Continental specific element and may be isolated 
for examination. In the following list the countries of extra- 
continental distribution are noted for each species, and pre- 
ceding each entry are given the letters which indicate the 
intra-continental range of the species. The list is herewith 
appended: 
E. List of Species and Varieties of Minnesota Valley Metas- 
taspermae which are of Extra-Continental Range, 
Monocotyledones, 
nsew. Typha latifolia. Eur., Asta, N. AFRICA. 
new. Sparganium simplex. Eur., Sr. 
nsew. Potamogeton natans. Eur., As., AUST., AFR. 
nsew. Potamogeton fluitans. Eur., As., AUST., AFR., S. AMER. 
nse. Potamogeton perfoliatus. Eur., As., AFR., AUST. 
new. Potamogeton heterophyllos. Eur., As. 
nse. Potamogeton gramineus var. zizii. Eur., As. 
nsew. Potamogeton pusillus. Eur., AFr., As.,S. AMER. 
new. Potamogeton rutilus. Eur., As., AFR. 
nsew. Potamogeton pectinatus. Hur., As., AUST. 
nsew. Potamogeton lucens. Hur., As., AFR., AUST., W. INDIES. 
new. Potamogeton praelongus. Eur. 
nsew. Potamogeton lanceolatus. Hur. 
new. Potamogeton zosteraefolius. Hur., As. 
nsew. Zanichellia palustris. HEur., As., AFR., PHILLIPINES, AUST. 
nsew. Najas flexilis. Eur., As., W. INDIES. 
new. Triglochin palustris. Hur., As., AFR., 5S. AMER. 
new. Triglochin maritima. Eur., As. AFR. 
new. Scheuchzeria palustris. Eur., As. 
new. Alisma plantago. Eur., As., AUST. AFR. 
new. Sagittaria sagittaefolia. Eur., As. 
nsew. Elodea canadensis. Eur., As. 
se. Vallisneria spiralis. Eur., As., AUST. 
se. Andropogon provincialis. FRANCE. 
sew. Cenchrus tribuloides. AFR., E. AND W. INDIEs. 
se. Zizania aquatica. SrB., JAPAN. 
nsew. Homalocenchrus oryzoides. Eur., As., AFR. 
new. Phalaris arundinacea. Eur., As. 
new. Hierochloé odorata var. fragrans. HEur., As. 
se. Muhlenbergia sobolifera. Hur. 
nsew. Agrostis hiemalis. As. 
nsew. Agrostis perennans. As.? 
nw. Deyeuxia neglecta. Eur., As. 
new. Deyeuxia canadensis. Six. 
